Annealing-furnace.



J. D. SWINDELL.

' ANNEALING FURNACE.

APPLIGATION FILED OCT. 26, 1909.

Patentd June 7,1910.

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fidzw/ NTOR A Home J. D. SWINDBLL. ANNEALING FURNACE; APPLICATION I'ILED OCT. 26, 1909 Patented June 7, 1910.

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Ill/l INVENTOR WITNESSES U n M U A JAMES DAVIS SWINIDELL, F PITTSBURG,PENNSYLVANIA.

ANNEALING-FURNACE.

Specification of Letters Patent.

Patented m a, 1910.

Application filed October 26, 1909. Serial No. 524,764.

To all whom it may concern.

Be it known that 1, JAMES Davrs SWIN- DELL, of Pittsburg, in thecounty'of Allegheny and State of Pennsylvania, have invented certain newand useful Improvements in Annealing-Furnaces; and I do hereby declarethe following to be a full,

clear, and exact description of the invention,

such as will enable others skilled inthe art to which it appertains tomake and use the same.

This invention relates to metallurgical apparatus and more particularlyto improvements in annealing furnaces, the object of the invention beingto construct an annealing furnace m'such manner as to insure an adequateand even distribution of heat in the furnace chamber with of gaseousfuel. 1

A further object is to so construct the furnace that the combustiblemixture of air and gas will beproperly united before becoming dischargedinto the furnace chamber.-

an economical use W'ith these objects 111 view the invention consists incertain novel features of construction and combinations of parts ashereinafter set forth and pointed out in the claims;

In the accompanying drawings, Figure 1 is a, transverse sectional Viewof an annealing furnace embodying my improvements.

Fig. 2 is a horizontal sectional view showing sections of the structureon lines F-F, G-G, HH and also E-'E of Fig. 1. Fig. 3 is a verticallongitudinal section on the lines AA, BB, and C0 of Fig. 2, and Fig. 4is a front elevation.

1 represents a furnace structure having therein a heating chamber 2provided on its floor 3 with suitable supports 4 to receive the articlesto be annealed or the containers of such articles. I

In the lower portion of the-furnace structure at respective sidesthereof, gas flues 5 are located and receive gas from suitable verticalpipes or flues 6 which communicate at their upper ends with a gas main7. A

series of vertical gas passages 8 communicate at their lower ends withthe respective gas flues 5 and at their upper ends, these gas passagesdischarge at 9- into the furnace chamber at respective sides of thelatter.

Located centrally in the base portion of the furnace structure is ahorizontal stack flue 10 which communicates at one end with a stack 11.Thestack flue 10 is provided at its top with a series -of inlet openingst2 which communicate with lateral passages 13 and the latter communicateat their outer ends with passages 14,sa'id' passages 13 and 14 beingformed-within a chamber 15- under the lloor of the heating chamber, bymeans out a horizontal bafile or partition 16 as clearly shown in Fig.1.; The passages 1a communicatc at the center of the furnace chamberwith outlet openings 17 for hot gases and products of combustion ashereinafter explained. Between the central stack'fiuelO and each gasflue 5, an air flue 18 is located. With the side of each air flue 18nearest the stack flue 10, a passage 19 communicates and, after passingthe side wall of the stack flue and the bottom and endwall ofchamber-15,-

said passage 19' communicates with the gas passage 8 below thedischarge'end of the-lab ter,a gas. and air mixing chamber being thusformed at 20 so that the gas and air will have been nlixed before beingdischarged through the openings 9 into the furnace chamber. It will beunderstood that the construction last above described occurs at bothsides of the furnace structure as shown in Fig. 1.

.From the construction and arrangement of parts above described it'willbe readily understood that combustible mixtures of air and gas at propertemperature-will be dis-' charged into the furnace chamber at respectivesides of the latter and that the Waste heat and products of combustionwill find their exit at the longitudinal center of the furnace chamberthrough the outlets '17 and through the passages 14 and 13 and finallyinto the top of the horizontal stack fine 10,

from which latter they will escape through the stack 11. [t is apparentthat the heat of the products of combustion escaping through thepassages 14, 13 and stack flue 10 will be utilized to raise thetemperature of the air as it passes from the air fines through thepassages -19 to the vertical passages 8 where said air mixes at 20 withthe gas as previously explained.

The furnace is provided at one end with suitable doors 21; the stack maybe provided with a suitable damper 22 and various changes mi ht be madein the details of construction o my invention without departing from thespirit thereof or limiting its sco and hence I do not wishto restrictmysel to the recise'details herein set forth.

Having tiilly described myinvention what I discharge outlets with saidstac I claim as new and desire to secure by Letters-Patent, is, 4

1. The combination of a furnace structure having a heating or annealingchamber, gas flues located in the furnace structure below the plane ofthe heating or annealing chamber, passages communicating with said gasflues and with the heating or annealing chamber at respective sides ofthe latter, air

passages communicating with said gas passages below the discharge endsof the latter thereby forming mixing chambers between the ends ofsaidgas passages, and means for conveying products of combustion from thelongitudinal central portion of the heating or annealing chamber andin.proximity to the wall of said air passages.

2. The combination of a furnace structure having a heating or annealingchamber, gas flues. located at respective sides'of the fur nacestructure below the plane of the heating or annealing chamber,gas'passages communicating at their lower ends'with said gas fines andat'their upper ends with the heating or annealing chamber at respectivesides of the latter, air flues located adjacent to the gas flues,passages communicating with said air flues and with said gas passagesbelow the discharge ends" of the latter, discharge outlets communicatingwith the longitudinal central portion of the heating or annealingchamber for the dischargeof products of combustion, a stack, andpassages adjacent to the air passages connectin the central 3. Thecombination of a furnace structure having a heating or annealingchamber, gas flues located in the base portion of the furnace structure'at respective sides of the latter and below the plane of the heating orannealing chamber, gas passages communicating with said gas flues anddischarging into the heating or annealing chamber at respective sides ofthe latter, a centrally located stack flue, passages connecting saidstack flue with the longitudinal central portion of the heating orannealing chamber, air fines located between the central stack flue andthe side gas flues, and air passages communicating with the inner sidesof the air flues and with the gas passages below the discharge ends ofthe latter, said air passages located adjacent to the passages whichcommunicate with the stack flue and the central portion of the furnacechamber.

4. The combination of a furnace structure having a heating or annealingchamber, inlets for air and gas communicating with said chamber at thesides thereof, means for supplying gas'to said inlets, a centrallylocated stack flue in the base portion of the furnace structure, meansforming chambers under the floor'of the heating or annealing chamber,and baffles or partitions in said chambers forming assages communicatingwith each other and respectively with the top of the stack flue and withthe central portion of the'heating or annealing chamber, and airpassages adjacent to said last mentioned passages and communicating withsaid inletsatthe sides of the furnace chamber.

5."The combination of a furnacestructure having a heating or annealingchamber, gas flues at respective sides of the furnace structure belowthe plane of the heating 01' annealing chamber, gas passagescommunicating with said gas flues and with the heating or annealingchamber at respective sides of the latter, acentrally located stack fluein the base portion of the furnace structure, means forming a chamberabove the stack flue and under the floor of the heating or annealing Ichamber, a baffle or partitionoin said inter posed chamber formingpassages communicating with each other andfgcommunicating respectivelywith the top of'the furnace flue and the central portion of the heatingor annealingchamber, air flues interposed between the gas flues andstack flue,and passages be tween the stack flue and air flues andbetween the gas and air flues and the bottom and side walls of theinterposed chamber, said passages communicating with the air flues atthe inner sides thereof and with the gas passages below the dischar eends of the latter.

In testimony whereo I have signed this specification in the presence oftwo subscribing witnesses.

JAMES DAVIS SWINDELL. Witnesses: I

H; A. SHAFFER, S. C. CARVER.

